Fixed Assets - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Mar. 31, 2012	Sep. 30, 2012	Sep. 30, 2011
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 171,000	$ 289,000
Proceeds from sale of machinery	$ 70,000	$ 70,000	$ 0